SunCast vs Alpenglow: plan the light or predict the sky?
SunCast and Alpenglow approach a sunrise or sunset from different directions. SunCast shows how sunlight moves through a place and what buildings, terrain, or planned structures will do to it. Alpenglow forecasts how promising the sky may be, then makes that outlook easy to follow across maps, widgets, notifications, and Apple Watch.
By Peter Szucs Last reviewed: August 5, 2026
Quick verdict
For planning light at a real location, SunCast is the stronger tool. Its AR path and 3D map answer not only where the sun will be, but what will actually be lit or shaded, with Street View, cloud cover, planned-structure shadows, and native solar alarms in the same workflow. Alpenglow is the better fit when the location is already settled and the main question is whether an upcoming sunrise or sunset is likely to produce strong color.
This comparison uses full feature sets and intentionally avoids pricing differences.
SunCast is strongest for
- Planning light and shade around real buildings and terrain
- Remote scouting with Street View, 3D shadows, and hourly cloud cover
- Testing how a planned structure will change the scene
Alpenglow may still fit for
- Forecasting the color potential of an upcoming sunrise or sunset
- Comparing forecast quality across an area on a map
- Following times and forecasts through widgets, Live Activities, and Apple Watch
Side-by-side feature comparison
| Feature | SunCast | Alpenglow | Why it matters |
|---|---|---|---|
| AR sun path | Live AR path | AR + alignment | Helps you visualize the sun's trajectory and lighting conditions before they occur. |
| Interactive map planning | 3D shadow map | Sun + forecast maps | Lets you plan sunlight at any location before arriving. |
| 3D building and terrain shadows | Yes | No 3D shadow map | Reveals whether buildings or terrain will block the light you need. |
| Custom construction shadow simulation | Adjustable 3D structures | No | Shows how proposed buildings could change surrounding light before they appear on the map. |
| Building solar information | Yes | No | Provides building-level solar potential, panel capacity, annual sunshine, and estimated energy output. |
| Street-view remote scouting | Sun path in Street View | No | Lets you inspect a distant location's sun path without being there. |
| Cloud and weather context | Hourly cloud cover | Sunrise/sunset forecast | Shows whether cloud cover may hide the light or shadows you planned for. |
| Solar event alarms | Native solar alarms | Event + forecast alarms | Turns a chosen solar event into a reminder or wake-up alarm. |
Why SunCast?
It plans the light inside the scene
Sun direction is only part of a location decision. SunCast also shows how surrounding buildings and terrain shape the usable light and shade as time moves.
It lets you scout the actual place
Street View and the 3D shadow map connect the solar geometry to the location itself, which is useful when a facade, street, garden, trail, or camera position is the real subject.
It can test a scene that does not exist yet
Construction Mode adds adjustable structures to the map, making future shadow impact part of the same workflow rather than a separate estimate.
Detailed comparison
Planning the light at a location
SunCast. SunCast turns the sun position into a spatial answer: which parts of the location will be lit, where shade will fall, and how that pattern changes through the day. Buildings and terrain are rendered alongside adjustable planned structures, so a current shadow check and a future-impact study can happen in the same scene. For a building-level solar check, Solar Info adds roof potential and estimated output.
Alpenglow. Alpenglow has a sun-direction map, an AR path, and an alignment finder that can identify when the sun reaches a chosen position in the camera view. It does not turn the surrounding buildings and terrain into a 3D shadow scene, so it cannot answer the same practical questions about what will block the light.
Reading upcoming conditions
SunCast. Hourly cloud cover sits alongside the map and shadow tools, helping you judge whether the light you planned is likely to reach the scene. The workflow also fits apartment, garden, architecture, hiking, and shade decisions where direct light matters even when a colorful sky does not.
Alpenglow. Alpenglow scores the expected quality of upcoming sunrises and sunsets and shows that outlook across locations, making it quick to decide whether the sky may be worth chasing. Its forecast map helps compare nearby areas, while field reports let users feed the observed result back into the forecasting system.
Following the plan
SunCast. Once you find the right light window, SunCast can set a native alarm for the solar event, including wake-ups and time-critical plans. The path from scouting through shadows, construction checks, cloud cover, and alarms stays centered on the same location decision.
Alpenglow. Alpenglow makes its times and forecasts easy to follow through Home Screen and Lock Screen widgets, Live Activities, Apple Watch complications, and notifications. Alongside regular event alarms, it can trigger an alarm only when the predicted sunrise or sunset quality clears a chosen threshold.
Bottom line
When the question is what the light will do at a particular place, SunCast is the more capable planner. It connects sun direction with scene-wide 3D shadows, Street View, planned structures, cloud cover, and native alarms, so the decision reflects the location rather than the sun path alone. Alpenglow is strongest at a different decision: whether an upcoming sunrise or sunset sky looks worth pursuing, especially when forecast maps and glanceable Apple-device updates matter.
Try SunCast
SunCast combines AR sun path, 3D shadows, street-view scouting, cloud cover, Construction Mode, and Solar Alarm for iPhone and iPad sunlight planning.
Frequently asked questions
Which app is better for golden hour planning?
SunCast is better when golden hour planning depends on where the light will land, what will block it, or how the scene will look from a real location. Alpenglow is better when the viewpoint is already chosen and the main concern is the predicted color quality of the sunrise or sunset sky.
Does Alpenglow show 3D building and terrain shadows?
No. Alpenglow provides sun direction and forecast maps plus an AR sun path and alignment finder, but it does not render scene-wide 3D shadows from surrounding buildings and terrain. SunCast does, and it can add planned structures to the same shadow scene.
Do SunCast and Alpenglow both have AR and alarms?
Yes. Both offer AR sun paths and solar-event alarms. SunCast connects those tools to 3D shadows, Street View, construction simulation, and cloud cover; Alpenglow connects them to sunrise and sunset quality forecasts, widgets, Live Activities, and Apple Watch.
